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JOINT BASE LEWIS-McCHORD, Wash. — A soldier suspected of killing 16 Afghan villagers Sunday comes from Joint Base Lewis-McChord, one of the largest military installations in the U.S. — and one that has seen its share of controversies and violence in the past few years.

The base, home to about 100,000 military and civilian personnel, has suffered a spate of suicides among soldiers back from war. The Army is investigating whether doctors at Lewis-McChord's Madigan Army Medical Center were urged to consider the cost of providing benefits when reviewing diagnoses of post-traumatic stress disorder.

Most famously, four Lewis-McChord soldiers were convicted in the deliberate thrill killings of three Afghan civilians in 2010.

The military newspaper Stars and Stripes called it "the most troubled base in the military" that year.

"It's another blow to this community," said Spc. Jared Richardson, an engineer, as he stood outside a barbershop near the base Sunday. "This is definitely something we don't need."

Catherine Caruso, a spokeswoman for Lewis-McChord, said she could not comment on reports that the soldier involved in Sunday's shooting was based there. A U.S. official speaking on the condition of anonymity told the AP that the shooter was a conventional soldier assigned to support a special operations unit of either Green Berets or Navy SEALs engaged in a village stability operation.

It wasn't immediately clear if the soldier was with Lewis-McChord's 3rd Brigade, 2nd Infantry Division, which sent about 2,500 soldiers to Afghanistan in December for a yearlong deployment. The brigade had deployed to Iraq three times since 2003; this is its first deployment to Afghanistan.

Lewis-McChord, a sprawling complex of red brick buildings, training fields and forests, is about 45 miles south of Seattle and has grown quickly since the Sept. 11, 2001, terror attacks.

Officials there have said that any community the size of the base is bound to have its problems, and its reputation has been tarred by "a small number of highly visible but isolated episodes" that don't accurately reflect the remarkable accomplishments of its service members, including their work overseas and the creation of new programs to support returning soldiers.

The controversies have indeed been highly visible.

Killings, suicidesIn 2010, a dozen soldiers from the base were arrested on a slew of charges that ranged from using drugs, beating up a whistleblower in their unit, and deliberately killing three Afghan civilians during patrols in Kandahar Province. Prosecutors at Lewis-McChord won convictions against four of the five who were charged in the killings.

After the first killing, the father of one of the soldiers called Lewis-McChord to report it — and to say that more killings were planned. The staff sergeant who took the call didn't report it to anyone else, saying he didn't have the authority to begin an investigation in a war zone. By the time the suspects were arrested months later, two more civilians were dead.

Army Staff Sgt. Calvin Gibbs, of Billings, Mont., the highest ranking defendant, was sentenced to life in prison. At his seven-day court martial at Lewis-McChord, Gibbs acknowledged cutting fingers off corpses and yanking out a victim's tooth to keep as war trophies, "like keeping the antlers off a deer you'd shoot."

There have been other episodes of violence involving the base's soldiers or former soldiers. A former soldier shot and injured a Salt Lake City police officer in 2010; he died when police returned fire.

On Jan. 1, a 24-year-old Iraq war veteran shot and killed a Mount Rainier National Park ranger before succumbing to the cold and drowning in a creek.

Last year, Lewis-McChord saw more suicides than ever before — 12, up from 9 in each of the prior two years. The Army has seen more suicides at bases across the country since the wars in Iraq and Afghanistan began.

The toll at Lewis-McChord rose despite new efforts to counsel soldiers when they come home from war, including the creation of a suicide-prevention office.

In the past five years, about 300 patients at Madigan Army Medical Center at the base had their PTSD diagnoses reversed by a forensic psychiatry team, The Seattle Times reported this month. The Army is reviewing whether those doctors were influenced by how much a PTSD diagnosis can cost, in terms of a pension and other benefits.

___

Johnson reported from Seattle

Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Video: Investigation under way in Afghan civilian killing by US soldier

Closed captioning of: Investigation under way in Afghan civilian killing by US soldier

>>latest on the phone is nbc news chief pentagon correspondent
jim miklaszewski
. mik, thank you for joining us. i know we are still getting details on thisins zpent conflicting reports on the number of dead. what do we have confirmed so far?

>>you know the most consistent reporting in terms of numbers, casualties here, come prosecuting the
afghan government
themselves including president
karzai
. who said that 16 civilians were killed and five wounded in the shooting rampage. and among the dead, according to president
karzai
, nine women -- nine children and three women. if in fact this was a pre-dawn shooting in a village can -- occurred inside at least one, if not two or three homes inside, one or two villages all still very confusing. and that would indicate in the predawn hours that these would have been groups of families in their sleep when this
lone gunman
reportedly allegedly walked into those houses in the villages. and opened fire. now, according to the
u.s. military
officials, the soldier walked back to base and immediately surrendered himself to house superior officers and back at the
military base
. and military officials, senior military officials, just a short time ago, was very emphatic and in stressing that these killings are considered a murder. that -- these are murdered victims who died in the hail of gunfire and this was not part of the
u.s. military
operation and even though president
karzai
has already described it as a nighttime raid. they are emphasizing that as of now, it appears to be the act of a
lone gunman
, motive unknown. but clearly, alex, this had to be a troubled person.

>>the way you describe this and this soldier walking back to the base just to, you know, explore what he had done, you can only imagine the reaction on the base. not only to the horrific nature of what allegedly had been done but the timing. talk about that. interest couldn't come at a worse time.

>>it is coming on the heels of the burning of the
koran
north of kabul which sparked violent rye sxots protests across the nation, killing dozens of protesters and ending indirectly in the deaths of at least six u.s. service members who are -- killed in retaliation for the burning of the
koran
. and -- look, you know, general
john allen
, top u.s. commander, who happened to be back here in washington right now, norah series of hearings and meetings, issued a statement saying he's shocked and the
u.s. military
dedicated to have the committed -- those who committed the wrongdoing be held fully accountable. it sounds very familiar to the language that occurred right after the burning of the
koran
. and i know it is really too early to tell exactly what happened in this case but with these two incidents, so closely occurring to each other, one has to start wondering about what the military calls the command climate there in
afghanistan
. our soldiers -- are the means rsh are the leaders there becoming a little slack perhaps in their discipline or enforcement of the rules and as the
u.s. military
is preparing to withdraw from
afghanistan
.
u.s. military
officials insist that is not the case. but, you know, this is -- this is too -- too much of a coincidence so close together. not to have people at least question what is going on in there -- there in
afghanistan
and has the discipline eroded as forces are preparing to withdraw.